Valve grinder



June 22, 1937.

w. E. JESSOP 2,084,959

VALVE GRINDER Filed Nov. 17, 1954 FLE- Patented June 22, 1937 UNITEDApplication November 17, 1934, Serial No. 753,488 In Canada November 17,1933 1 Claim.

The invention relates to improvements in valve grinders as described inthe present specification and shown in the accompanying drawing thatforms a part of the same.

The main object of the invention is to provide a simple tool of fewparts which may be easily operated and which will impart an oscillatoryand also a rotary movement to the valve which is necessary in thegrinding of engine valves.

The invention consists in the novel features of construction,arrangements and combinations described in the present specification andmore particularly pointed out in the claim for novelty following.

In the drawing Figure l is a side elevation partly in vertical sectiontaken on substantially the line l-l of Figure 3, of the grinding tooldisassembled from the motor, the spindle being foreshortened.

Figure 2 is a vertical sectional view taken on the line 22 of Figure l,the motor being shown in side elevation incorporated therewith.

Figure 3 is a cross sectional view taken on the line 3-a3 of Figure 2.

Figure 4 is a cross sectional view taken on the line l4 of Figure 2.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawing I is the motor having at the upper end thereofa centrally disposed handle 2 through which extends the electric wiring3 from the body of the motor to a depressible button switch 4 located inthe outer end of said handle.

The operating shaft 5 of the motor i projects outwardly from theopposite, or lower end of the motor and such shaft is threaded, as at 6,towards the outer end thereof. I

A casing head 1 is secured over the lower end of the motor I inlongitudinal alignment therewith, preferably by means of straps 8extending outwardly therefrom and secured to the sides of said motor,said head having a central opening 9 through which the shaft 5 looselyextends and being concaved as shown at H]. Positioned in the concavedunder face of the head i and encircling the shaft 5 is a ring gear H theteeth 52 of which are preferably circular in cross section and extentoutwardly parallel to the shaft A cylindrical gear housing or casing I3is rotatably mounted on the outer end of the head I, said head beingreduced slightly as at It for the reception thereof, and is held inposition by v 55 means of an encircling collar l5 secured at its top endto said head by means of screws or other fastening elements l6, saidcollar, or sleeve being provided with a Washer ll or being otherwiseshaped to extend around a shoulder 8 with which the housing is providedto prevent the withdrawal of said housing therefrom in the assembledcondition of the grinder. The housing i3 is reduced at its lower end andextends outwardly a considerable distance past the collar 15 in acylindrical spindle housing l9. A spindle 20 is rotatable within thehousing l9 and projects from each end thereof, the inner end thereofprojecting a short distance into the interior of the housing I3 and theouter end thereof being adapted for the reception of a chuck 2! adaptedto receive the valve engaging implement (the latter not being shown inthe drawing as there are many known types of same and such implementdoes not constitute a feature of the present invention). The lower wallof the housing l3 and the outer end of the spindle housing 19 areprovided with suitable bearings 22 and 23 respectively through whichsaid spindle extends and said spindle is held in relation to saidbearings by nuts 24 and 25 threading over said spindle. A suitablepacking gland is inserted in the outer end of the housing I9 to preventthe escape of the lubricating substance from the interior.

2? is a shaft positioned transversely of the housing l3 to one side ofthe diametrical centre thereof and substantially midway of the depth ofsaid housing, said shaft being offset at one end thereof to provide aneccentric portion 28 and being journalled at its ends in bearing blocks29 rigidly secured within said housing. A pinion 3!) is fixedly mountedcentrally of said shaft in mesh with the motor shaft 5 by means of whichthe said shaft 27, is rotated. Also rigidly mounted on the shaft 2'! isa worm gear M with which the teeth l2 of the gear H are adapted to meshso that as the shaft 2'! is rotated the housing l3 will be rotatedslowly around the central shaft.

Loosely encircling the eccentric, or crank, portion 28 of the shaft 21is a collar 32 having an arm 33 extending at right angles to said shaftpast the motor shaft 5 and pivoted to the under side of said arm is alink 34 which is secured at its end to the top end of the spindle 2D sothat on the rotation of said shaft 2'! longitudinal oscillatory movementwill be imparted to said arm and this movement will be translated to arotary oscillatory movement of said spindle. The eccentric portion 28 isprovided with bevelled side flanges 35 adapted to permit of thenecessary Cal connected to the source of electric current and the toolplaced in vertical position on the valve with the valve engaging tool inoperative engagement with said valve. The button 4 is then depressed toclose the electric circuit in said motor and rotate the shaft 5. As saidshaft rotates it rotates the shaft 27 through the medium of the pinion30 and said shaft 2? through the eccentric movement of the crank 28causes rotary oscillation of the spindle 25. During the rotation of theshaft 27 the rotary movement of the enlarged worm gear through itsengagement with the teeth l2 of the stationary gear it causes the wholehousing to rotate slowly and thus rotate the valve slowly on its seatduring the oscillatory movement of the said valve.

While the preferred embodiment of my invention has been herein shown anddescribed it is of course to be understood that alterations in minordetails of construction and arrangement of parts as comes within thescope of the claim for novelty following may be made.

What I claim is: a

In a valve grinder, the combination with a motor casing having a wormdriving shaft extending therefrom, of a non-rotatable ring gearencircling said driving shaft, the teeth of said gear being circular incross section and extending parallel with said shaft, a housingrotatable around said ring gear, a tool carrying spindle 'rotatablyjournaled in said housing in axial alignment with said driving shaft andspaced therefrom, a shaft mounted within said housing in transverserelation to said driving shaft and having a crank portion towards oneend thereof, 'said shaft also having a worm wheel meshing with saiddriving shaft, an arm extending laterally from said tool carryingspindle, a rod loosely mounted at one end on the crank portion of saidtransverse shaft and having connection at its other end with the end ofsaid arm from the tool carrying spindle, and a wormgear carried by saidtransverse shaft and in operative engagement with saidnon-rotatable ringgear.

WILLIAM E/JESSOP.

